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6q=7q-9
We move all terms to the left:
6q-(7q-9)=0
We get rid of parentheses
6q-7q+9=0
We add all the numbers together, and all the variables
-1q+9=0
We move all terms containing q to the left, all other terms to the right
-q=-9
q=-9/-1
q=+9
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